Astronauts living and working on Mars would require possibly one metric ton of oxygen to last one year, Hecht added.

赫克特补充说，宇航员在火星上生活和工作可能需要1吨氧气才能维持一年。

A 20-year-old Belgium student Leopold Hecht died in the metro station blast. Those killed or wounded came from around 40 different countries, reflecting the cosmopolitan nature of Brussels.

20岁的比利时学生利奥波德·赫克特在地铁爆炸案中丧生。死伤者来自40多个国家，这也说明布鲁塞尔是个国际大都会。